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Your MCP Tool Errors Are Written for the Wrong Reader

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

An agent called our calendar tool eleven times in ninety seconds. Same arguments, same failure, same response. It only stopped because the token budget ran out. The tool was working exactly as designed. It returned a 409 with {"error": "Conflict"}, which is a perfectly reasonable thing for an HTTP…

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  1. 2026-09-04 08:05 · DEV Community — AI
    Your MCP Tool Errors Are Written for the Wrong Reader

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